Mathematics, 19.12.2019 05:31 lalllda
Considered safe for agricultural use. a well in texas is used to water crops. this well is tested on a regular basis for arsenic. a random sample of 36 tests gave a sample mean of = 7.3 ppb arsenic, with s = 1.9 ppb. does this information indicate that the mean level of arsenic in this well is less than 8 ppb? use a 0.01 level of signifcance..
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Considered safe for agricultural use. a well in texas is used to water crops. this well is tested on...
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